Tbh, i failed to understand how you came to the conclusion that "This guy's career advice led her to sell her body to make ends meet to pursue her dream".
I put this into spoilers to not spoil, but anyway
In the same sentence you quoted, I also said this :
making the guy look bad for trying to help her, when she made the decisions anyway.
Writing this story by placing the teacher's counseling just before
the girl's failed carrer choice leads me to think he should have done a better job, even though he did all he could.
Except him, parents could have helped the girl, but we don't see them do that except when they congratulated her on her success, so the blame falls on teacher alone even though it's not his fault.
I can't blame the child for what she did, I could only blame the lack of support she recieved while studying, working, and since only teacher procured advice, the blame falls on him when it shouldn't, like I said.
Author chose to write that way and it feels fabricated and not like a real story, although this could happen irl, I can't relate to it.
On the other hand, the girl resorting to
selling her body when she wasn't in debt and didn't need a big amount of money to survive and do a retraining makes absolutely no sense to me, I won't even blame her or any character but will blame author's writing skills for this.